Custom trigger when specific ability was the last ability used

Description

What I’m looking for is a wa trigger that would detect whenever ability 100784 (blackout kick) was the last ability used. I don’t want an icon showing the last ability (I already have a wa that does that), but I want a trigger that would specifically look for blackout kick as the last ability used. Ultimately what I’m trying to create is a wa that would alert me when blackout kick was the last ability used AND I currently have less than 50 energy. Obviously the energy trigger is simple. The custom trigger for blackout kick is what I’m struggling with.